Photographic



B. H. MEYERING.

PHOIOGRAPHIC FILM.

APPLICATION FILED MAY 31. 1915.

1,321,067. j PatentedN0 .4,1919.

INVENTOR. fier/zazziA flgg r y A TTORNEY UNITED sTArEs raranr orrron.

BERNARD H. MEYERIN G, OF ROCHESTER, NEW YORK, ASSIGNOR T EASTMAN KOI DAK COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

PHO'DOGRAPHIC FILM.

Specification of Letters Patent.

Patented ov. 4, 1919.

Application filed May 31, 1918. Serial No. 237,587.

ING, a citizen of the United States of America,

residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Photographic Films, of whichthe following is a full, clear, and exact specification.

This invention relates to photographic film sheets, leader strips, and improved connections between such sheets and strips.

One object of my invention is to provide mechanical or interlocked joints between film sheets and leader strips which will reliably take up the normal teactive forces eX- erted thereon during use. This greatly reduces the possibility of the joints pulling apart, which possibility is present when adhesive connections to the surfaces of the film 2 sheets are alone depended on. Another object of my invention is to supplement the mechanical joints with vadhesive connections, which not only take up some of the pull but aid in maintaining th parts of the me 2 5 chanical joints in their position of maximum strength. Still another object is to provide a connecting sheet which covers and partly smooths out any irregularities in the mechanical joint that might cause pressure markings in the sensitive film when the latter is rolled up. A further object is to provide a slot and doubled tongue joint be tween the film sheets and leader strips, in

l which the slot or opening is free from sharp angles where tears might start, in which the fold of the tongue is kept'evenly against an edge of the opening to avoid any chance for a progressive'cutting of the tongue by said edge, and in which a plurality of tongues 40 may be used if desired. Other objects will hereinafter appear.

Figure 1 is a plan view of a film cartridge embodying my invention, the parts being unrolled;

Fig. 2 is a fragmentary plan view of one end of a film sheet on an enlarged scale;

Fig. 3 is a fragmentary plan view of one end of a leader strip;

Fig. 4 is a plan view of a covering and connecting sheet or sticker;

F ig. 5 is a'longitudinal fragmentary sectional view of a partially complete joint between the adjacent ends of a film sheet and leader strip;

Fig. 6 is a longitudinal sectional view through the completed joint; ig. 'Z is a plan view of the completed olnt;

Fig. 8 is a plan view of my invention embodied in a wider film where a plurality of slots and tongues are used;

Fig. 9 is a transverse sectional view showtional spool.

In film, photography it has been customary to provide film sheets, with leader strips for ing my cartridge wound upon the conven pulling them through a camera or other apparatus, the leader strips being attached to the film merely by an adhesive connection. Since the surfaces of film sheets, whether coated or uncoated with gelatin, are partially resistant to adhesives, it has been difficult in manufacturing upon a large scale to keep connections strong enough for practical requirements. I have found that a positive interlocking or mechanical connection can be used which greatly reduces any possibility of the joints separating. Since my invention'is especially useful for connecting theparts of certain types of roll film cartridges, I shall illustrate it as embodied in such cartridges, but it is, of course, not limited thereto except as indicated in the claims. 1

In Fig. 1 I have shown a flexible film sheet 1 with its sensitized surface upward, at the ends of which are provided alined flexible opaque leader strips 2 connected with, the sheet by my improved joints 3.

, The leader strips serve to draw the sheet 1 through .a camera or other apparatusand protect it from actinic light when wound upon a spool, as indicated in- Fig. 9, the illustrated cartridge being ofthe daylight loading variety.

As shown in Fig. :2, the ends of sheet 1 are provided with transverse slots 4, the walls of which are smooth, that is, free from any sharp angles where a tear might readily start. Of course, any other suitable round. ended opening might be substituted. Each leader strip '2 is provided with a tongue 5 which is narrower than the strip and is of proper dimensions to enter slot 4, as indiferred way, such as by cated in Fig. 5. ferred, form is long enough when doubled back to rest upon the body of the strip 2, as shown in Fig. 6. The end of the tongue may be fastened to the strip in any preadhesive-on the inner face of the tongue, but in practice it is simpler. to employ an adhesive covering or connecting sheet or sticker 6 which is preferably fastened down to film 5 and strip 2. Instead of adhering to all three of these elements, sticker 6. may be connected simply to sheet 1; and strip' 2,

thereby covering tongue that it is always held in position. The adhesive on the sticker 1s of a type which adheres reasonably well both to the paper of lead strip 2 and the gelatin or emulsion coated side of film sheet 1. It does not'need to stick strongly-enough to take up all the tensile or tractive stresses. The covering sheet 6 is preferably of about the same width as sheet 1 and strips 2 and is of sufiicient longitudinal entent to cover the adjacent ends of the sheet and strip together with the slot and doubled tongue. As indicated in Fig. 6 and Fig. 9, this tends to smooth out or even up the face of the 5 'insuch a way doubled or hooked cartridge and thereby minimize the chance of pressure marklngs caused by any adjacent convolutions of the sensitive surface when the-cartridge is coiled-up.

The doubled tongue 5 when attached to the strip 2 is sufficient to take up the tractive forces which are imposed upon it during use in the camera or other apparatus. In order, however, that it may exert its full strength it is desirable that the fold in the tongue be kept in even or uniform engagement with the ed e 7 of slot 4. For convenience in manufacture, the slot a isordinarily made wider than the thickness of the lead strip 2 and consequently some play or angularv shifting of the parts might take place if no provision were made against it. Such shifting would put the leader strip out of alinement with the film sheet 1 and only one end of the folded portion of the tongue 5 would be in engagement with the edge 7 of the slot. Since a large part of the pull would thus come on this one end, it would tend to give away and the edge 7 would then tend to cut across the foldd portion of tongue 5 progressively in much the same way that an angularly held paper knife or blade is used to sever the uncut leaves of a necessarily sufiicien new book.

My supplemental? sticker 6, while not t y adherent to take up the entire pull or tractive forces is, nevertheless, strong enough to keep strip 2 in alinement with sheet 1, thereby maintaining the fold in tongue 5 parallel to or in uniform engagement with the edge 7 of slot -l-. With the pull thus distributed a maximum This tongue in my pre sheet 1, tongue earner strength is obtained and cutting action prac tically avoided. Of course a sticker adherent merely to the tongue 5 and sheet 1 would be quite effective to maintain the fold of the tongue in proper relationto edge 7.

In the case of wide film, instead of enlarging the slots 4 and tongues 5. it may be preferable to provide separate slots ll in which are placed tongues 51 that are doubled back upon the strip 2 and attached in the same way as tongues 5.

In Fig. 9 the slotted shank of a conventional spoolis shown at S and the flange at 9, while 10 represents a small paster for holding the outer convolution of strip 2 in place. As shown in Fig. 3, the ends of tongues 5 may be out diagonally at 11 and the connecting shoulders between the tongue 12. Of course, the tongues 5 need not be integral with or of the same material as strips 2, but preferably they are cut from the same sheet of paper.

It will thus be seen that the adhesive con nection coeperates with the mechanical joint m in several ways,it holds the tongue in hooked or interlocking position; it keeps the fold in the ton ue in uniform non-cutting engagement wit the edge of the slot' and it covers and smooths out the irregularity produced by the doubled tongue.

Having thus described my invention what I claim and desire to secure by Letters Pat ent of the United States is:

1. In combination, a photographic film. sheet havinga slot therein and a leader strip provided with a doubled loop tractively en- 'gaged in said slot.

2. In combination, a photographic. film sheet having a slot therein and a leader strip provided with a tongue extending through said slot, the end of said tongue being doubled back upon and connected with. said strip. 3. In combination, sheet having a plurality of slots therein adjacent an edge thereof and a leader strip provided with a plurality of doubled loops. each of said loops tractively engaging in one of said slots.

4:. In combination, a photographic film sheet having aslot therein, aleader strip provided with a tongue extending through said slot, and a fastening sheet connected to said tongue, said strip, and said film sheet.

5. In combination, a photographic film sheet having at one end. a slot therein, a leader strip provided at one end with a tongue engaged in said slot, and a smooth. sheet covering said tongue, said slot, said end of said film sheet, and said end of said leader strip. I

6. In a film cartridge, a flexible photo graphic film sheet provided with slots adjacent its ends, and flexible opaque leader a photographic film .11.

5 and strip 2 may be inclined, as shown at engaged in one of said slots.

7. In a film cartridge, a flexible photographic film 'sheet provided with slots adja cent its ends, and flexible opaqueleader strips at said ends, each strip being provided with. a tongue extending through a slot, the, end of .eac-htongue being doubled back upon' its strip and stickers connecting said ends of said Sheets with said strips and covering said doubled'ends of said tongues.

8. In a film cartridge, a flexible photographic filmsheet provided with slots adjacent its ends, and flexible opaque leader strips at said ends and alined with said sheet, each strip being provided with a tongue tractively engaged in a slot, and fastening sheets connected to and aiding alinement between said sheet ends and said strips.

9. Incombination, a photographic film sheet, a. leader stripalined therewith and connected to an end thereof by a mechanical joint suflic-iently strong to Withstand the normal tractive forces in tea, and a sticker between said sheet end and said strip for keeping said sheet and strip in alinement.

10. In combination, a photographic film sheet havingtherein a ing freefrom sharp angles, and a leader strip provided with a doubled loop tractively engaged in said opening.

11. In combination, a photographic film sheet having therein an opening provided.

with an edge transverse to the length of the film, a leader strip for'pulling the film in the direction of its length, said strip having a tongue with a transverse fold engaging said edge throughout its length, and

means for maintaining the parts in such en gagement.

Signed at Rochester, New York, this 23rd day of May, 1918.

BERNARD H. 'MEYE'RING.

smooth-walled open- 

